M52-M42(17-31) 17mm-31mm M52 to M42 Mount Camera Lens Adapter Ring Macro Extension Tube Helicoid Lens Focusing Adapter Ring for Macro Photography

[Broad Compatibility] Suitable for M52 mount lens and M42 mount adapter ring, providing a focusing system for camera., [Focus Length] Can be adjusted from 17mm to 31mm, support manual focusing, satisfying your various needs, flexible and convenient to use., [Macro Extension Tube] Can be used as an old lens and macro extension tube, perfect for macro photography, digital camera photography, and more, easy to install and use., [Premium Aluminum Alloy Construction] Made from high-quality aluminum alloy with advanced anodic oxidation technique, sturdy and durable., [Compact Size and Light Weight] Max. 7cm diameter and weights only 99g, convenient for storage and carrying.